Some of this may already be in effect and i dont know it.
This is for NPCs as well as MPC vampires
What if when vampires are physically damaged to 0 HP they turn into a fast moving mist. They then have to go back to their coffin to regenerate?
While in this mist form they would be invulnerable.
This could lead to exciting tracking and chases
Perhaps also allow the MPCs to conduct some sort of dark ritual to make more coffins?
Something that would require a lot of rare things and would be clues alerting the player base (that know about such things) that this is underway
It allows the MPC a hard-earned reward- an additional coffin, plus it drives different sides into conflict and alliances.
Another idea is for vampires (NPCs as well as MPCs) to turn into rats
3 for very weak ones, 4 for moderate, 5, for strong, 10 for very strong.
The vampire/ player would be the lead rat and the others would follow.
overall HP would be divided up by # of rats
so 3- each would be 33%
4- 25%
5- 20%
10- 10%
Attacking the lead rat or one of the others would drop the PCs HP overall
don't know if its possible and don't know if it would be a lag drain. just an idea